/* ============================================
   COLKITO'S WEB - Main Stylesheet
   Vanilla CSS equivalent of Tailwind config
   ============================================ */

/* ====================
   CSS Custom Properties
   ==================== */
:root {
  /* Emerald (primary) - from Tailwind colors.emerald */
  --primary-50: #ecfdf5;
  --primary-100: #d1fae5;
  --primary-200: #a7f3d0;
  --primary-300: #6ee7b7;
  --primary-400: #34d399;
  --primary-500: #10b981;
  --primary-600: #059669;
  --primary-700: #047857;
  --primary-800: #065f46;
  --primary-900: #064e3b;

  /* Slate (gray) - from Tailwind colors.slate */
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;
  --gray-950: #020617;

  /* Font */
  --font-sans: 'Noto Sans', ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;

  /* Container widths */
  --max-w-3xl: 768px;
  --max-w-5xl: 1024px;

  /* Spacing scale (Tailwind) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-7: 1.75rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;

  /* Light mode defaults */
  --bg-primary: #ffffff;
  --bg-secondary: var(--gray-50);
  --text-primary: var(--gray-900);
  --text-secondary: var(--gray-500);
  --text-muted: var(--gray-400);
  --border-color: var(--gray-200);
  --link-color: var(--primary-500);
  --link-hover: var(--primary-600);
}

/* Dark mode overrides */
.dark {
  --bg-primary: var(--gray-800);
  --bg-secondary: var(--gray-900);
  --text-primary: #ffffff;
  --text-secondary: var(--gray-300);
  --text-muted: var(--gray-400);
  --border-color: var(--gray-700);
  --link-color: var(--primary-500);
  --link-hover: var(--primary-400);
}

/* ====================
   Base Styles / Reset
   ==================== */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.5;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  /* Prevent layout shift from scrollbar */
  padding-left: calc(100vw - 100%);
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

button {
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
  padding: 0;
}

ul, ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

h1, h2, h3, h4, h5, h6, p {
  margin: 0;
}

/* Screen reader only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ====================
   Layout
   ==================== */
.section-container {
  max-width: var(--max-w-3xl);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

@media (min-width: 640px) {
  .section-container {
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }
}

@media (min-width: 1280px) {
  .section-container {
    max-width: var(--max-w-5xl);
    padding-left: 0;
    padding-right: 0;
  }
}

.site-wrapper {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 100vh;
}

main {
  margin-bottom: auto;
}

/* ====================
   Header
   ==================== */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-10);
  padding-bottom: var(--space-10);
}

.header-logo {
  display: flex;
  align-items: center;
}

.header-logo img {
  width: 36px;
  height: 36px;
  border-radius: 50%;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  line-height: 1.25;
}

@media (min-width: 640px) {
  .header-nav {
    gap: var(--space-6);
  }
}

.nav-link {
  display: none;
  font-weight: 500;
  color: var(--gray-900);
  transition: color 0.15s ease;
}

.dark .nav-link {
  color: var(--gray-100);
}

.nav-link:hover {
  color: var(--primary-500);
}

.dark .nav-link:hover {
  color: var(--primary-400);
}

@media (min-width: 640px) {
  .nav-link {
    display: block;
  }
}

/* ====================
   Theme Switch
   ==================== */
.theme-switch {
  position: relative;
  display: inline-block;
  margin-right: var(--space-5);
}

.theme-switch-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  transition: color 0.15s ease;
}

.theme-switch-btn:hover {
  color: var(--primary-500);
}

.dark .theme-switch-btn:hover {
  color: var(--primary-400);
}

.theme-switch-btn svg {
  width: 1.5rem;
  height: 1.5rem;
}

.theme-menu {
  position: absolute;
  right: 0;
  top: 100%;
  margin-top: var(--space-2);
  width: 8rem;
  background: var(--bg-primary);
  border-radius: 0.375rem;
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--border-color);
  z-index: 50;
  opacity: 0;
  visibility: hidden;
  transform: scale(0.95);
  transition: opacity 0.1s ease, transform 0.1s ease, visibility 0.1s ease;
}

.theme-menu.open {
  opacity: 1;
  visibility: visible;
  transform: scale(1);
}

.theme-menu-inner {
  padding: var(--space-1);
}

.theme-option {
  display: flex;
  align-items: center;
  width: 100%;
  padding: var(--space-2);
  font-size: 0.875rem;
  border-radius: 0.375rem;
  color: var(--text-primary);
  transition: background-color 0.15s ease, color 0.15s ease;
}

.theme-option:hover {
  background-color: var(--primary-600);
  color: white;
}

.theme-option svg {
  width: 1.5rem;
  height: 1.5rem;
  margin-right: var(--space-2);
}

/* ====================
   Mobile Navigation
   ==================== */
.mobile-nav-toggle {
  display: block;
  color: var(--gray-900);
  transition: color 0.15s ease;
}

.dark .mobile-nav-toggle {
  color: var(--gray-100);
}

.mobile-nav-toggle:hover {
  color: var(--primary-500);
}

.dark .mobile-nav-toggle:hover {
  color: var(--primary-400);
}

.mobile-nav-toggle svg {
  width: 2rem;
  height: 2rem;
}

@media (min-width: 640px) {
  .mobile-nav-toggle {
    display: none;
  }
}

.mobile-nav-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.25);
  z-index: 10;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.mobile-nav-overlay.open {
  opacity: 1;
  visibility: visible;
}

.mobile-nav-panel {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--bg-primary);
  opacity: 0.95;
  z-index: 20;
  transform: translateX(100%);
  transition: transform 0.3s ease;
}

.dark .mobile-nav-panel {
  background-color: var(--gray-950);
  opacity: 0.98;
}

.mobile-nav-panel.open {
  transform: translateX(0);
}

.mobile-nav-links {
  position: fixed;
  margin-top: var(--space-8);
  height: 100%;
  text-align: left;
}

.mobile-nav-link {
  display: block;
  padding: var(--space-4) var(--space-12);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--gray-900);
  transition: color 0.15s ease;
}

.dark .mobile-nav-link {
  color: var(--gray-100);
}

.mobile-nav-link:hover {
  color: var(--primary-500);
}

.dark .mobile-nav-link:hover {
  color: var(--primary-400);
}

.mobile-nav-close {
  position: absolute;
  top: 2.75rem;
  right: var(--space-8);
  color: var(--gray-900);
  transition: color 0.15s ease;
}

.dark .mobile-nav-close {
  color: var(--gray-100);
}

.mobile-nav-close:hover {
  color: var(--primary-500);
}

.dark .mobile-nav-close:hover {
  color: var(--primary-400);
}

.mobile-nav-close svg {
  width: 2rem;
  height: 2rem;
}

/* ====================
   Footer
   ==================== */
.site-footer {
  margin-top: var(--space-16);
  margin-bottom: var(--space-8);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
}

@media (min-width: 640px) {
  .footer-inner {
    flex-direction: row;
    gap: 0;
  }
}

.social-icons {
  display: flex;
  gap: var(--space-7);
}

.social-icon {
  color: var(--text-secondary);
  transition: color 0.15s ease;
}

.social-icon:hover {
  color: var(--text-primary);
}

.social-icon svg {
  width: 1.25rem;
  height: 1.25rem;
  fill: currentColor;
}

.footer-meta {
  display: flex;
  gap: var(--space-2);
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.footer-meta a {
  color: inherit;
  transition: color 0.15s ease;
}

.footer-meta a:hover {
  color: var(--text-primary);
}

/* ====================
   Home Page
   ==================== */
.home-hero {
  padding-top: var(--space-6);
  padding-bottom: var(--space-8);
}

.home-title {
  font-size: 1.875rem;
  font-weight: 800;
  color: var(--gray-900);
}

.dark .home-title {
  color: var(--gray-100);
}

.home-bio {
  margin-top: var(--space-4);
  font-size: 1.125rem;
  line-height: 2;
  color: var(--text-secondary);
}

.dark .home-bio {
  color: var(--gray-300);
}

.home-links {
  margin-top: var(--space-4);
}

.home-links p {
  font-size: 1.125rem;
  color: var(--text-secondary);
}

/* ====================
   Links
   ==================== */
.link-primary {
  color: var(--primary-500);
  transition: color 0.15s ease;
}

.link-primary:hover {
  color: var(--primary-600);
}

.dark .link-primary:hover {
  color: var(--primary-400);
}

/* ====================
   Dividers
   ==================== */
.divide-y > * + * {
  border-top: 1px solid var(--gray-200);
}

.dark .divide-y > * + * {
  border-top-color: var(--gray-700);
}

/* ====================
   Post List
   ==================== */
.post-list {
  margin: 0;
  padding: 0;
}

.post-item {
  padding-top: var(--space-12);
  padding-bottom: var(--space-12);
}

.post-item:first-child {
  padding-top: var(--space-12);
}

.post-meta {
  margin-bottom: var(--space-2);
}

@media (min-width: 1280px) {
  .post-item-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    align-items: baseline;
    gap: 0;
  }

  .post-meta {
    margin-bottom: 0;
  }

  .post-content {
    grid-column: span 3;
  }
}

.post-date {
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.5;
  color: var(--text-secondary);
}

.post-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.post-header {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.post-title {
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 2;
  letter-spacing: -0.025em;
}

.post-title a {
  color: var(--gray-900);
  transition: color 0.15s ease;
}

.dark .post-title a {
  color: var(--gray-100);
}

.post-title a:hover {
  color: var(--primary-500);
}

.post-summary {
  color: var(--text-secondary);
}

.post-read-more {
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.5;
}

/* ====================
   Tags
   ==================== */
.tags-list {
  display: flex;
  flex-wrap: wrap;
}

.tag {
  margin-right: var(--space-3);
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  color: var(--primary-500);
  transition: color 0.15s ease;
}

.tag:hover {
  color: var(--primary-600);
}

.dark .tag:hover {
  color: var(--primary-400);
}

/* ====================
   Page Headers
   ==================== */
.page-header {
  padding-top: var(--space-6);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--border-color);
}

.page-title {
  font-size: 1.875rem;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.025em;
  color: var(--gray-900);
}

.dark .page-title {
  color: var(--gray-100);
}

@media (min-width: 640px) {
  .page-title {
    font-size: 2.25rem;
    line-height: 1.2;
  }
}

@media (min-width: 768px) {
  .page-title {
    font-size: 3rem;
    line-height: 1.1;
  }
}

/* ====================
   Blog Post Page
   ==================== */
.post-banner {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 0.5rem;
  margin-bottom: var(--space-8);
}

.post-page-header {
  text-align: center;
  padding-top: var(--space-6);
  padding-bottom: var(--space-6);
}

.post-page-date {
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.5;
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
}

.ai-badge-wrapper {
  display: flex;
  justify-content: center;
  margin-top: var(--space-4);
}

.ai-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.375rem;
  padding: 0.375rem 0.75rem;
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.025em;
  background-color: transparent;
  color: var(--gray-400);
  border: 1px solid var(--gray-300);
  border-radius: 9999px;
  line-height: 1;
}

.dark .ai-badge {
  color: var(--gray-500);
  border-color: var(--gray-600);
}

.ai-badge img {
  width: 0.875rem;
  height: 0.875rem;
  flex-shrink: 0;
  opacity: 0.7;
}

.post-page-title {
  font-size: 1.875rem;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.025em;
  color: var(--gray-900);
}

.dark .post-page-title {
  color: var(--gray-100);
}

@media (min-width: 640px) {
  .post-page-title {
    font-size: 2.25rem;
  }
}

@media (min-width: 768px) {
  .post-page-title {
    font-size: 3rem;
  }
}

.post-page-subtitle {
  margin-top: var(--space-4);
  font-size: 1.125rem;
  color: var(--text-secondary);
}

.post-body {
  padding-top: var(--space-10);
  padding-bottom: var(--space-8);
  border-bottom: 1px solid var(--border-color);
}

.post-footer {
  padding-top: var(--space-6);
  padding-bottom: var(--space-6);
}

.post-tags {
  margin-bottom: var(--space-4);
}

.post-tags-label {
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
}

.post-nav {
  display: flex;
  justify-content: space-between;
  padding-top: var(--space-4);
  border-top: 1px solid var(--border-color);
}

.post-nav-prev,
.post-nav-next {
  max-width: 45%;
}

.post-nav-label {
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: var(--space-1);
}

.post-nav a {
  color: var(--primary-500);
  font-weight: 500;
  transition: color 0.15s ease;
}

.post-nav a:hover {
  color: var(--primary-600);
}

.dark .post-nav a:hover {
  color: var(--primary-400);
}

.post-nav-next {
  text-align: right;
  margin-left: auto;
}

/* ====================
   Projects Page
   ==================== */
.projects-grid {
  display: grid;
  gap: var(--space-6);
  padding-top: var(--space-8);
}

@media (min-width: 768px) {
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.project-card {
  border: 2px solid var(--gray-200);
  border-radius: 0.375rem;
  overflow: hidden;
  transition: box-shadow 0.15s ease;
}

.dark .project-card {
  border-color: var(--gray-700);
}

.project-card:hover {
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.project-image {
  width: 100%;
  height: 9rem;
  object-fit: cover;
}

@media (min-width: 1024px) {
  .project-image {
    height: 12rem;
  }
}

.project-content {
  padding: var(--space-6);
}

.project-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--space-3);
}

.project-title a {
  color: var(--gray-900);
  transition: color 0.15s ease;
}

.dark .project-title a {
  color: var(--gray-100);
}

.project-title a:hover {
  color: var(--primary-500);
}

.project-description {
  color: var(--text-secondary);
}

/* ====================
   About Page
   ==================== */
.about-content {
  padding-top: var(--space-8);
}

.about-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-6);
  padding-bottom: var(--space-8);
}

@media (min-width: 768px) {
  .about-header {
    flex-direction: row;
  }
}

.about-avatar {
  width: 12rem;
  height: 12rem;
  border-radius: 50%;
  object-fit: cover;
}

.about-info {
  text-align: center;
}

@media (min-width: 768px) {
  .about-info {
    text-align: left;
  }
}

.about-name {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--gray-900);
}

.dark .about-name {
  color: var(--gray-100);
}

.about-role {
  color: var(--text-secondary);
  margin-top: var(--space-1);
}

.about-social {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
  margin-top: var(--space-4);
}

@media (min-width: 768px) {
  .about-social {
    justify-content: flex-start;
  }
}

/* ====================
   Tags Page
   ==================== */
.tags-page-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  padding-top: var(--space-8);
}

.tag-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.tag-count {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
}

/* ====================
   404 Page
   ==================== */
.not-found {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-16) 0;
}

.not-found-code {
  font-size: 6rem;
  font-weight: 800;
  color: var(--primary-500);
}

.not-found-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-top: var(--space-4);
}

.not-found-text {
  color: var(--text-secondary);
  margin-top: var(--space-2);
}

.not-found-link {
  margin-top: var(--space-8);
}

/* ====================
   Utilities
   ==================== */
.text-center {
  text-align: center;
}

.flex {
  display: flex;
}

.flex-wrap {
  flex-wrap: wrap;
}

.items-center {
  align-items: center;
}

.justify-center {
  justify-content: center;
}

.justify-between {
  justify-content: space-between;
}

.justify-end {
  justify-content: flex-end;
}

.hidden {
  display: none;
}

@media (min-width: 640px) {
  .sm-block {
    display: block;
  }
  .sm-hidden {
    display: none;
  }
}